Energetics and Enzyme Function

Reaction that results in an INCREASE of free energy (energy is put in).

• endergonic

• exergonic

• spontaneous

Reaction that results in a DECREASE of free energy (energy is released)

• endergonic

• exergonic

• nonspontaneous

Tags

NGSS.HS-PS1-4

Spontaneous reactions are always fast reactions.

• true

• false

Which is TRUE of enzymes?

• enzymes lower activation energy but do not affect spatial orientation

• enzymes increase the activation energy and spatially affect reactants

• enzymes decrease activation energy and help reactants bind by affecting spatial orientation

• enzymes are reactants that decrease activation energy and decrease the concentration of reactants

What is an active site?

• the place where non-spontaneous reactions gain energy and become spontaneous

• the catalyst for the reaction

• the place where chemical activity or reactions occur

• the place where non-spontaneous reactions occur

When an enyzme catalyses a reaction, the ___________ decreases.

• free energy of reactants

• free energy of products

• progress of reaction

• activation energy

Tags

NGSS.HS-PS1-4

True or False: Since Enzymes catalyze a reaction, they affect the amount of free energy in either reactants or products.

• true

• false

Tags

NGSS.HS-PS1-5

Which of the following is a correct association?

• non-spontaneous reaction --- exergonic

• spontaneous reaction --- endergonic

• non-spontaneous --- endergonic

• spontaneous reaction --- isogonic

Tags

NGSS.HS-PS1-4

Which is correct?

• when a chemical reaction increases entropy when products are compared to reactants, it is non-spontaneous

• when a chemical reaction leads to lower potential energy when products are compared to reactants, it is non-spontaneous

• reactions are spontaneous when free energy is lower in the products than the reactants

• reactions are spontaneous when free energy is higher in the products than the reactants

Phosphorylation allows motor proteins to undergo conformational changes by _______________.

• adding many positive charges

• adding many tightly packed negative charges

• lowering potential energy